Discoveries in Humans
The 3’ to 5’ human type endonuclease is known to be essential for the proper processing of histone pre-mRNA, in which U7 snRNP directs the single cleavage process. Following the removal of the downstream cleavage product (DCP) 5’ to 3’ exonuclease continues to further breakdown the product until it is completely degraded. This allows the nucleotides to be recycled. 5’ To 3’ exonuclease is linked to a co-transcriptional cleavage (CoTC) activity that acts as a precursor to develop a free 5’ unprotected end, so the exonuclease can remove and degrade the downstream cleavage product (DCP). This initiates transcriptional termination because one does not want DNA or RNA strands building up in their bodies.
Read more about this topic: Exonuclease
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